Enabling MT for an IS-IS Interface

After IS-IS MT is enabled, associate a specified interface with MT instances.

Context

Various topology instances can be associated with one interface so that specified links of the interface can participate in the SPF calculation for the topology instances.

The following parameters can be configured for an interface in different topology instances:

Cost of the interface in each topology instance
Administrative tag of the interface in each topology instance

An interface transmitting different services needs to be associated with different topology instances. Perform the following operations:

Associate an interface with an IPv4 topology instance.
Associate an interface with an IPv6 topology instance.

Procedure

Associate an interface with an IPv4 topology instance.
1. Run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The interface view is displayed.
3. Run ip topology topology-name enable
  An IPv4 topology instance is bound to the interface.
4. Run isis topology topology-name
  An IPv4 topology instance is enabled on the interface.
5. (Optional) Run isis topology topology-name cost cost [ level-1 | level-2 ]
  A cost is configured on the interface for the IS-IS IPv4 topology instance.
  
  A cost change on an interface will trigger route reselection. Therefore, change the cost during network planning.
6. (Optional) Run isis topology topology-name tag-value tag [ level-1 | level-2 ]
  An administrative tag is configured on the interface for the IS-IS IPv4 topology instance.
  
  An administrative tag is carried in routes and used by route-policies to filter routes.
7. Run commit
  The configuration is committed.
Associate an interface with an IPv6 topology instance.
1. Run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The interface view is displayed.
3. Run ipv6 topology topology-name enable
  An IPv6 topology instance is bound to the interface.
4. Run isis ipv6 topology topology-name
  An IPv6 topology instance is enabled on the interface.
5. (Optional) Run isis ipv6 [ topology topology-name ] cost cost-value [ level-1 | level-2 ]
  A cost is configured on the interface for the IS-IS IPv6 topology instance.
  
  A cost change on an interface will trigger route reselection. Therefore, change the cost during network planning.
6. (Optional) Run isis ipv6 [ topology topology-name ] tag-value tag [ level-1 | level-2 ]
  An administrative tag is configured on the interface for the IS-IS IPv6 topology instance.
  
  An administrative tag is carried in routes and used by route-policies to filter routes.
7. Run commit
  The configuration is committed.